EFFECT OF POTASSIUM POLYVINYLSULFATE OF VARIOUS DEGREES OF SULFATION ON THE FORMATION OF HYDROXYAPATITE IN AN AQUEOUS PHASE

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Effect of potassium polyvinylsulfate(Sulf. PVA) on the formation of hydroxyapatite(HAP) via amorphous calcium phosphate (ACP) in an aqueous phase was studied in the presence of 0.9 % NaCl at 35°C Sulf. PVA retarded the transformation of ACP to HAP, although polyvinylalcohol(PVA) showed no effects on the formation. This effect became more significant with increases in the concentration and degree of sulfation( α ) of Sulf. PVA. This was explained in terms of (1)the crystal poisoning through isomorphous substitution and (2)electrostatic repulsion against Pi in the adsorption layer of Sulf. PVA on the HAP seed surface.